High-voltage asymmetric supercapacitors operating in aqueous electrolyte

Khomenko, Volodymyr; Raymundo-Piñero, E.; Frąckowiak, Elżbieta; Béguin, F.

doi:10.1007/s00339-005-3397-8

Cited by 355 publications

(223 citation statements)

References 26 publications

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“…The copolymer and PPy electrode both displayed a decreased current at high voltage, which might be explained by a redox process taking place at the limits and beyond a given potential range which could lead to the formation of passive layers of poor conductivity [28]. No such phenomenon was observed for PTPT, which still kept its rectangular shape even at 500 mV s -1 .…”

Section: Supercapacitor Performance Of Polymer Electrodesmentioning

confidence: 87%

Electrodeposition of pyrrole and 3-(4-tert-butylphenyl)thiophene copolymer for supercapacitor applications

et al. 2012

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The electropolymerization of pyrrole (Py), 3-(4-tert-butylphenyl)thiophene (TPT) monomer or the mixed Py and TPT monomers on stainless steel mesh substrate were performed in 1 M LiClO4/acetonitrile solution. A much lower potential of 0.75 V was required for the co-electropolymerization of Py and TPT, in sharp contrast to that of 1.20 V for poly(3-(4-tert-butylphenyl)thiophene) (PTPT) formation. The resultant homopolymers and copolymer were characterized with FESEM and FTIR, and assembled into supercapacitors to investigate their electrochemical performances. The copolymer electrode delivered the highest specific capacitance of 291 F g−1 at a scan rate of 5 mV s−1, in comparison with that of 216 and 26 F g−1 for PPy and PTPT, respectively. This copolymer also exhibited a greatly improved cycling stability -only 9% of capacitance decrease was observed after 1000 charging-discharging cycles at a current density of 5 A g−1, while the capacitance losses for PPy and PTPT were 16% and 60%, respectively. ABSTRACTThe electropolymerization of pyrrole (Py), 3-(4-tertbutylphenyl)thiophene

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Section: Supercapacitor Performance Of Polymer Electrodesmentioning

confidence: 87%

Electrodeposition of pyrrole and 3-(4-tert-butylphenyl)thiophene copolymer for supercapacitor applications

et al. 2012

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“…Furthermore, in this configuration, the high over potentials for H 2 and O 2 evolution at the negative electrode (usually carbon materials) and pseudocapacitive positive electrode, extends the effective potential window of aqueous electrolytes beyond the thermodynamic limit (~1.2 V), which results in significantly higher capacitance and energy density than for symmetric ECs in aqueous electrolytes [4]. Generally, aqueous electrolytes (such as KOH or Na 2 SO 4 ) supports high-power operation because of their high ionic conductivity and high concentrations of ions, while providing cost and safety advantages of a water-based electrolyte compared to non-aqueous electrolytes [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Some of these studies include, activated carbon (AC)//manganese oxides (MnO 2 ) [15,16], carbon nanotube//MnO 2 [13], AC//Ni(OH) 2 [17]. Conducting polymers, polymer composite materials and carbon materials such as CNT have also been reported for ASC applications some of which are: AC//conducting polymers [6,18], CoO@polypyrrole//activated carbon [19] and carbon nanotube/PANI (CNT/PANI) [20] just to mention a few.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric supercapacitor based on nanostructured graphene foam/polyvinyl alcohol/formaldehyde and activated carbon electrodes

Bello

Barzegar

Momodu

et al. 2015

Journal of Power Sources

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We present the electrochemical results of highly porous and interconnected carbon material by activation of graphene foam/polyvinyl alcohol-formaldehyde composite material designated as GF/PVA-F. Asymmetric supercapacitor devices were fabricated using the activated material (GF/PVA-F) and activated carbon (AC) as the positive and negative electrodes respectively. The device exhibited a maximum energy density of 42 mWh cm -2 , a power density of 0.5 W cm -2 and 98% retention of its initial capacitance after 2000 cycles in an extended cell potential window of 1.8 V in 1 M Na 2 SO 4 aqueous electrolyte. This work shows the great potential of this material for high performance energy storage application.

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“…[1][2][3][4][5][6][7][8][9] They are generally classified into two categories, depending on the charge-storage mechanism. In electric double layer capacitors (EDLCs), the performance is correlated with the specific surface area of the activated carbons (AC), but is also influenced by other parameters, such as the pore size.…”

Section: Introductionmentioning

confidence: 99%

PEDOT:PSS/Single Wall Carbon Nanotube Composite Nanoparticles as an Additive for Electric-double Layer Capacitor

Park¹,

Lee²,

Ahn³

2012

Journal of Electrochemical Science and Technology

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:The unique effects of highly conductive conducting polymer/SWNT (single walled carbon nanotube) composite nanoparticles in electric double layer capacitors are studied for the enhancement of the adhesive properties, specific capacitance and power characteristics of the electrode. Because the conducting polymer/SWNT composite material, which is believed to act as a polymer binder, an active material for charge storage and a conducting agent, is well distributed on the activated carbon, greatly enhanced adhesion properties, cell capacitance and power characteristics were obtained.

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High-voltage asymmetric supercapacitors operating in aqueous electrolyte

Cited by 355 publications

References 26 publications

Electrodeposition of pyrrole and 3-(4-tert-butylphenyl)thiophene copolymer for supercapacitor applications

Electrodeposition of pyrrole and 3-(4-tert-butylphenyl)thiophene copolymer for supercapacitor applications

Asymmetric supercapacitor based on nanostructured graphene foam/polyvinyl alcohol/formaldehyde and activated carbon electrodes

PEDOT:PSS/Single Wall Carbon Nanotube Composite Nanoparticles as an Additive for Electric-double Layer Capacitor

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